| /** |
| * Copyright 2010 The Apache Software Foundation |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hbase.ipc; |
| |
| import org.apache.hadoop.hbase.HMsg; |
| import org.apache.hadoop.hbase.HRegionInfo; |
| import org.apache.hadoop.hbase.HServerInfo; |
| import org.apache.hadoop.io.MapWritable; |
| |
| import java.io.IOException; |
| |
| /** |
| * HRegionServers interact with the HMasterRegionInterface to report on local |
| * goings-on and to obtain data-handling instructions from the HMaster. |
| * <p>Changes here need to be reflected in HbaseObjectWritable HbaseRPC#Invoker. |
| * |
| * <p>NOTE: if you change the interface, you must change the RPC version |
| * number in HBaseRPCProtocolVersion |
| * |
| */ |
| public interface HMasterRegionInterface extends HBaseRPCProtocolVersion { |
| |
| /** |
| * Called when a region server first starts |
| * @param info server info |
| * @param serverCurrentTime The current time of the region server in ms |
| * @throws IOException e |
| * @return Configuration for the regionserver to use: e.g. filesystem, |
| * hbase rootdir, etc. |
| */ |
| public MapWritable regionServerStartup(HServerInfo info, |
| long serverCurrentTime) throws IOException; |
| |
| /** |
| * Called to renew lease, tell master what the region server is doing and to |
| * receive new instructions from the master |
| * |
| * @param info server's address and start code |
| * @param msgs things the region server wants to tell the master |
| * @param mostLoadedRegions Array of HRegionInfos that should contain the |
| * reporting server's most loaded regions. These are candidates for being |
| * rebalanced. |
| * @return instructions from the master to the region server |
| * @throws IOException e |
| */ |
| public HMsg[] regionServerReport(HServerInfo info, HMsg msgs[], |
| HRegionInfo mostLoadedRegions[]) |
| throws IOException; |
| } |